Electromagnet for clocks and motors.



G. ARNOLD.

ELEOTROMAGNET FOB. GLOGKS AND MOTORS.

APPLICATION FILED MAY 11, 1908.

929,269, Patented July 27,1909

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, CAROhUS ARNOLD, O F HAMBURG, GERMANY.

ELECTROMAGNET FOR CLOCKS AND MOTOR$.

Specification of'Lette'rs Patent.

Patented July 27, 1909.

Application filed May 11, 1908. Serial No. 432,315.

To all whom it may concern:

Be it known that I, OARoLUs ARNOLD, a citizen of Hamburg, and resident of No. 53

WYeidenallee, Ham urg, in the Empire of. Germany, have invented new and useful Improvcments in Electromagnets Especially for Driving Electric Clocks and Small Motors, of which the following is a specification. The present invention relates to electromagnets for small motors, especially for motorsemployed in periodically winding up or driving clocks. y

The object the invention aims atconsists in suppressing the interrupter spark, which j s obgeotlonably noticeable in apparatus of thelzind reicrred to when inserted in intense current circuits.

Further objects of the invention consist in providing lor the purposes mentioned an electromagnet of handy shape and In con structing the machines invsuch a manner that same can be inserted directly in intense current circuits without any dar'iger and without special auxiliary devices being re- ..quired. Q a" Further objects of the invention are to simplify and cheapen the construction and to render more efficient serviceable and durable in operation devices of the kind referred to.

With. these ends in view the invention con- -isists in the novel combination, arrangement 1 out in the appended claims.

I In the drawing is shown an electromagnet constructed in accordance with the principle fofthis invention applied by way of example to an electric clock. v

Figure 1 shows in frontelevation, partly in section, the clockwork and the electrojinagnct, Fig. 2 is a plan view,.partly in sec- ,tion, of the electromagnet separately. g It is well known for extinguishing the interrupter'spark between the terminals of the magnet coils to insert special resistance coils for, producing a short circuit or to insert suit able resistances for protecting the coils in their connection with the intense current circuit. v For tlie electromagncts of small appara tus such de'vicesare either too complicated or they require too' muclrroom. Furthermore said safety appliances rendendiflicult the fitting up and the manipulation of the whole apparatus.

In electromagnets constructed according to the principle of this invention a special resistance coil is rendered unnecessary for the reason that a second reslstance coil of suit-- ably thin and 'long wire is wound over the wire coils for energizing the magnet cores, the extremities of said second coil being connected with the ends of the magnet coils for the reception of the induced current set up at the moment the interruption takes place.

According to circumstances or requirements both magnet coils or only one may be provided with a second resistance coil of 'the nature set forth.

To avoid induction in the resistance OOll itself, same may be produced bifilar in the well known manner and the free ends may be connected together and to the terminals of the magnet coils in an appropriate manner for suppressing induction. Or' the wire for the IGSlStBIlOGCOil is doubled back in the 7 middle of its length and is thereupon bifilar wound, so that two inter-connected coils of equal lengths originate which run in oppo-.

site directions.

The electromagnet 1 is so arran ed that 7 its coresdepend at both sides of the clock work 2 while on top thereof they are united together by a bridge. Each core carries an or pole shoes 4 is mounted on a suitable bearlng pin an oscillatin armature 5, which at each circuit closure y the contact device 6 raises the weighted lever 7 and in consequence winds up the clock a corresponding amount The weighted lever 7 and the armature 5 are shown in Fig. 1 in one of their two extreme positions.

Around one of the magnet coils 3-in the instance illustrated in the drawing the ri ht hand one'is arranged-the resistance coil 8.

The connection between the magnet coils 3 and the resistance coil, which consists of a double wire t'. e.- of two coils of opposite di inary magnetizlng coil 3. Between the V rections, is effected in .l he following manner.'

p The two ends-9 and 10 of the left hand coil 3, as indicated in Fi a are so connected 9 with the ends 11 and 12 of the righthand 105 coil, that both coils are'in series and the mag 0 net cores are simultaneously energized 1n opposite sense. The ends 13 and L4 of the re sistance 8 are inserted in the wires 9 and 11 and 10and 12 respectively. The connection 1 of receiving the interrupter 15 of the Wires 9, 11 and 13 leads to one terminal of the source of electricity; the connection 16 of the wires 10, 12 and 14 is attached to the contact spring 17, which is mounted on the clock work insulated therefrom and aim as my invention, and defor the reception or absorption of the eli'ees the clock Work itself is connected with the i or" inductionset up in breaking, the circuit,

second terminal of the source of electricity.

As will be readily understood without further detailed description, on breaking the circuit by the contact device 6 the two coils 3 are closed by the induetionless double resistancecoil 8, so that no spark emission is possible.

'l he manner of connection may be varied in any suitable and convenient way, the characteristic feature of the invention consisting in the arrangement, that the inductionless resistance coil surmounts one or both of the magnet coils, which are advantageously coupled in series, for the purpose spark or the induced current set 11 in..:breal:in,g the circuit respectively wit rout the necessity ol a special eoil.

I do not desire to be understood as limitin myself to the detail construction and arrangement of parts as herein shown and described, as it is manifest that variations and modifications therein may be resorted to, in the adaptation of my invention to varying conditions of use, witlnnit depruting from the spirit amt "sag, ie of my intention and improvements. therefore reserve the right to all properly falls within the scope of my inven tion and the terms of the follmving claiins.

l l l l such variationmid modification as? said resistance being arranged in the forn'i o'lan imluetionless double coil of opposite directions upon the. magnet coils directly, substantially as described and shown and for the purposes ."et forth.

2. An electrornagnet for ing up clocks provided with a. res]. tance wire 8 arrangml around the ord said resi tanee wire being wound bililar, so that two parallel but oppositely directed coils are produced, whose outer ends are each connected with separate ends of the magnet coil 3, substantially as and for the purpose set forth.

3. An electrmnagnet for use with electric periodic-Lily windromagnet for small motors and for driving; electric clocks, a resn-itance l inary coil 3, r

clocks provided with a resistance coil in the shape ol an inductionless coil of suitably tlnn wire arranged around the ordinary magnet coils, for the purpose of savinga resiz-zta-nrw. and l'or facilitating a coin structure, substantially pose set forth.

In witness whereof I have hereunto signed my name this 6th day of April 1908, in the presence oltwo subscribing witnesses.

CA] tOLl IS A RN OLD.

separate pendious l/Vitnesses:

l lunns'r H. L. ltlurnuunnorr, ()T'ro W. lInLLMmou.

as and for the pur- 

